I had a growth scan at 28 weeks because my baby has sever heart defects. But they said they expect babies with these heart defects to do well in the womb and be born on time..... so my scan should have shown around 2lbs 6-8oz but instead he was 1lb 11oz. He's been marked around 25th centile and we have another scan in a few weeks. Of course I'm terrified as it is about having my baby but now this on top has me very worried. I was told placenta problems can cause a small baby but this becomes apparent after 34 weeks.... so I'm worried what's going on ! I did have an amnio done at 21 weeks and it all came back clear so I don't think my baby has a chromosome abnormality